US4972307A - Structure of headlamps for vehicles - Google Patents

Structure of headlamps for vehicles Download PDF

Info

Publication number
US4972307A
US4972307A US07/348,113 US34811389A US4972307A US 4972307 A US4972307 A US 4972307A US 34811389 A US34811389 A US 34811389A US 4972307 A US4972307 A US 4972307A
Authority
US
United States
Prior art keywords
zone
light
prism
lens
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/348,113
Other languages
English (en)
Inventor
Kouichi Takatsuji
Masao Naruke
Takayuki Isobe
Masato Mochizuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Ichikoh Industries Ltd
Original Assignee
Nissan Motor Co Ltd
Ichikoh Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd, Ichikoh Industries Ltd filed Critical Nissan Motor Co Ltd
Application granted granted Critical
Publication of US4972307A publication Critical patent/US4972307A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/334—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of patch like sectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/162—Incandescent light sources, e.g. filament or halogen lamps
    • F21S41/164—Incandescent light sources, e.g. filament or halogen lamps having two or more filaments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/19—Attachment of light sources or lamp holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/33—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature
    • F21S41/331—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas
    • F21S41/333—Multi-surface reflectors, e.g. reflectors with facets or reflectors with portions of different curvature the reflector consisting of complete annular areas with discontinuity at the junction between adjacent areas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/36—Combinations of two or more separate reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/68—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens
    • F21S41/683—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on screens by moving screens
    • F21S41/692—Shields, i.e. screens not creating an image meant to be projected

Definitions

  • the present invention relates to structures of headlamps for vehicles having a front lens, a light source, and a reflector for reflecting light incident from the light source in a direction toward the front lens, the front lens being slanted with respect to a vertical direction of a vehicle body.
  • the reflector includes a first light-reflecting surface like a substantially paraboloid of revolution at a center part thereof and a second light-reflecting surface at a peripheral portion on which flat stepwise portions and paraboloid of revolution surface having mutually different focal distances are alternatingly continued.
  • slant-type headlamps in which the front lens is slanted with respect to the front surface of the vehicle body, are currently available on the market.
  • an illumination pattern (so-called light distribution pattern) is distorted in such a form that both ends of the distribution pattern in a horizontal axial (H) direction droops with respect to an actual desirable light distribution pattern.
  • H horizontal axial
  • both ends of the light distribution pattern in the horizontal axial direction rise and therefore the light irradiation by means of the headlamp structure described above in the right side direction in a country where traffic keeps to the left or on the left side in the case of U.S. may glare on the opposing vehicles passing to one side of the vehicle.
  • a structure of a headlamp for a moving object comprising: a housing; a light source; a lens located ahead of the light source and slanted with respect to a vertical direction of the moving object; and means for straightening both ends of a horizontally diffused light distribution pattern on a screen located in front of a front surface of the lens by a predetermined distance.
  • a structure of a headlamp for a vehicle comprising: a housing; a light source; a front lens located ahead of the light source and slanted with respect to an optical axis of the housing and a vertical direction of a vehicle body, the front lens having a first prism zone for forming a light diffusion zone in a light distribution pattern of the head lamp on a given screen and a second prism zone for forming a light hot zone in the same light distribution pattern thereof; and a reflecting mirror for reflecting light beams emitted from the light source in a direction toward the front lens, the reflecting mirror having a first reflecting surface corresponding optically to the first prism zone for diffusing the light beams emitted from the light source in a horizontal cross section thereof with respect to an optical axis of the light source.
  • a structure of a headlamp for a vehicle comprising: a housing; a light source; a lens located ahead of the light source with respect to an optical axis of the light source and slanted with respect to a vertical direction of a vehicle body, the front lens having a prism zone for forming a light diffusion zone in a light distribution pattern of the head lamp and another prism zone for forming a light hot zone in the light distribution pattern; and a reflector for reflecting light beams emitted from the light source toward the front lens, the reflector being formed with a reflecting surface which corresponds to the diffusion zone forming prism zone of the front lens, diffuses the light beams emitted from the light source in a horizontal cross section thereof with respect to the optical axis, and reflects them in parallel to the optical axis in a vertical cross section and with a remaining reflecting surface substantially in a paraboloid of revolution surface shape.
  • FIG. 1 is a longitudinally sectioned view of a headlamp structure in a first preferred embodiment according to the present invention.
  • FIG. 2 is a front view of prism zones of a lens shown in FIG. 1.
  • FIG. 3 is a front view of a reflector shown in FIG. 1.
  • FIGS. 4, 5, and 6 are sectioned views of the reflector cut away along lines IV--IV, V--V, and VI--VI of FIG. 3.
  • FIG. 7 is an explanatory view for explaining a light distribution pattern of light beams irradiated from the headlamps each having the structure shown in FIG. 1 in a driving beam mode.
  • FIG. 8 is an explanatory view for explaining a light distribution pattern on a test given screen in a mode of an asymmetrical passing beam in which an opposing vehicle passes aside the vehicle in which the headlamps each of which is shown in FIG. 1 are mounted.
  • FIG. 9 is an explanatory view for explaining a road surface light distribution pattern on the given screen in the mode of the same case as shown in FIG. 8.
  • FIG. 10 is a front view of prism zones of the front lens in the headlamp structure for the vehicles in a second preferred embodiment according to the present invention.
  • FIG. 11 is a front view of the reflector shown in FIG. 10.
  • FIG. 12 is a partially perspective view of a conical surface prism.
  • FIG. 13 is a perspective view of one of elements of the conical surface prism shown in FIG. 12.
  • FIG. 14 is an explanatory view for explaining a light distribution pattern on the given screen of the light beam in the driving beam mode.
  • FIG. 15 is an explanatory view for explaining a light distribution pattern on a test screen in the mode of the asymmetrical passing beam in which another vehicle passes in the opposite direction.
  • FIG. 16 is a front view of the reflector in the headlamp structure for the vehicles in a third preferred embodiment according to the present invention.
  • FIGS. 17, 18, and 19 are sectional views of the reflector cut away along the lines XVII--XVII, XVIII--XVIII, and XIX--XIX in FIG. 16.
  • FIGS. 1 to 9 show a first preferred embodiment of the structure of the headlamp for vehicles according to the present invention.
  • a pair of the headlamp structures shown in FIG. 1 are mounted on selected left and right front surfaces of a vehicle body.
  • a housing 1 for mounting the headlamp on the vehicle body covers a partial structure of the headlamp.
  • the housing 1 has a front opening 10 at a front surface thereof and a rear opening 11 at a rear center surface thereof.
  • a front lens 2 is fixed to the front opening 10 of the housing 1 through a process of bonding, packing, clipping, or the like.
  • the front lens 2 is formed with a circular cylindrical surface prism 20 at a rear surface of the lens 2, a front surface of which is slanted so as to face in a given upper direction with respect to the housing 1.
  • the front lens 2 as shown in FIG.
  • a first prism zone A at an upper left side of the lens 2 for forming a diffusion zone comprises: a first prism zone A at an upper left side of the lens 2 for forming a diffusion zone; a second prism zone B at an upper right side thereof for forming a diffusion zone; a third prism zone C at the upper left side thereof for forming a hot zone; a fourth prism zone D at an upper middle right side thereof for forming a hot zone; a fifth prism zone E at a center left side thereof for forming a hot zone; a sixth prism zone F at an upper center area thereof for forming a diffusion zone; a seventh prism zone G for forming a prism zone for forming a hot zone, exclusively used for a light beam when the vehicle runs (in a driving beam mode) at a lower side thereof; and an eighth prism zone H for forming a diffusion zone exclusively used for the light beam when the vehicle runs (in the driving beam mode) at a lower side thereof.
  • a reflector 3 is disposed within a light chamber defined by the housing 1 and front lens 2.
  • the reflector 3 is provided with openings at the front surface and rear center surface, respectively.
  • Parts 31 and 36 of the reflector 3 which correspond to the first, second, fifth, and eighth prism zones A, B, F, and H for forming diffusion zones of the lens 2 form a first reflecting surface which diffuses the light beams in a
  • the first reflecting surface in a convex form is formed a multiple number on an upper end part 31 of the reflector 3 which corresponds to the first prism zone A for forming the diffusion zone at the upper left side thereof, the second prism zone B for forming the diffusion zone at the upper right side, and the sixth prism zone F for forming the diffusion zone at the upper middle center, and on a lower end part 36 which corresponds to the eighth prism zone H for forming the diffusion zone exclusive by used for the light beam in the driving beam mode.
  • each upper and lower part of the first reflecting surface is subdivided into six blocks.
  • the first reflecting surface 31 and 36 is formed of continuous convex-shaped parts along a peripheral edge thereof of a semi-circular surface shown in FIG. 5 which shows the cross section taken along a line X--X of FIG. 3.
  • the first reflecting surface 31 and 36 diffuses and reflects the light beams emitted from the light source left and right in a horizontal cross section with respect to the optical axis X--X with the directions of the normal lines at different points on the convex curved surface changed.
  • the parabolic form thereof causes the light beams from the light source to be reflected in parallel to the optical axis X--X in the vertical cross section with respect to the optical axis.
  • the first reflecting surface 31 and 36 having such a diffusion function as described above is formed so as to correspond to all of the first, second, and eighth prism zones A, B, and H for forming the diffusion zones of the front lens 2 and part or all of the sixth prism zone F.
  • an electric bulb 4 is installed as a light source.
  • the bulb 4 includes a glass tube 40, a main filament 41 installed within the glass tube and used when the vehicle runs (in the driving beam mode), a sub filament 42 used when an opposing vehicle passes by the vehicle (in the asymmetrical passing beam mode), a shade 43, and base 44.
  • the base 44 of the bulb 4 is attached to the opening at the center of the rear surface of the reflector 3 and the main filament 41 of the bulb 4 is located in the vicinity of a focus "f" of the second reflecting surface 30.
  • a water-proof cap 5 made of rubber is installed at the rear center opening of the housing 1.
  • the water-proof cap 5 includes a transparent hole 50, skirt 51, and engagement portion 52.
  • the transparent hole 50 of the water-proof cap 5 encapsulates the base 44 of the bulb 4 and the engagement portion 52 of the water-proof cap 5 is engaged with the rear opening 11 of the housing 1.
  • the reflected light beam of the light transmitted from the main filament 41 advance substantially in parallel to the optical axis X--X and falls on the third prism zone C for forming the hot zone at the upper left side of the front lens 2, the fourth prism zone D for forming the hot zone at the center right side, the fifth prism zone E for forming the hot zone at the middle left side, and the seventh prism zone G for forming the hot zone exclusively used for the beam during the vehicle run at the lower part, respectively.
  • the incident light beams on these prism zones then irradiate a front illumination area via the front surface of the front lens 2.
  • hot zones (C), (D), (E), and (G) are formed on a screen installed, e.g., 10 meters away from the front surface of the lens 2 (25 feet in SAE).
  • the light beams which fall on and are reflected from the first reflecting surface part 31 and 36 diffuse left and right in the horizontal cross section with respect to the optical axis X--X and advances substantially in parallel to each other in the vertical cross section.
  • first prism zone A for forming the diffusion zone at the upper left side
  • second prism zone B for forming the diffusion zone at the upper right side
  • sixth prism zone F for forming the diffusion zone at the upper middle center part
  • eighth prism zone H for forming the diffusion zone exclusively used for the beam in the driving beam mode, are diffused therefrom, and are irradiated toward the front illumination area.
  • upper diffusion zone (A), (B), and (F) and lower diffusion zone (H) are formed on the above-specified screen, respectively.
  • the light beams from the main filament 41 of the bulb 4 are diffused left and right in the horizontal cross section with respect to the optical axis X--X and are reflected substantially in parallel to the optical axis X--X in the vertical cross section.
  • the light beams from the main filament 41 of the bulb 4 are diffused left and right in the horizontal cross section with respect to the optical axis X--X and are reflected substantially in parallel to the axis X--X in the vertical cross section to become incident on each zone A, B, F and H of the lens 2.
  • the reflected light beams from among those from the sub filament 42 which have fallen on the second reflecting surface 30 of the reflector 3 advance in a light collecting state (slightly downwards) with respect to the optical axis X--X.
  • These reflected light beams fall on the third prism zone C for forming the hot zone at the upper left side, the fourth prism zone D for forming the hot zone at the upper middle right side, and fifth prism zone E for forming the hot zone at the middle left side, respectively.
  • These incident light beams are irradiated toward the forward illumination area via the front lens 2.
  • the hot zones (C), (D), and (E) are formed on the above-described test screen.
  • the reflected light beams which have fallen on the first reflecting surface 31 are diffused left and right in the horizontal cross section with respect to the optical axis X--X and advances in the light-collecting state in the vertical cross section, and falls on the first prism A for forming the diffusion zone at the upper left side, the second prism zone B for forming the diffusion zone at the upper right side, and sixth prism zone F for forming the diffusion zone at the upper middle center part, are diffused therefrom, and are irradiated toward the forward illumination area.
  • the integrated diffusion zone (A), (B) and (F) is formed on the above-described screen. Consequently, such droops generated at both ends of the light distribution pattern in the horizontal direction (H) as denoted by the broken lines of FIG. 8 can be eliminated. Consequently, the desired light distribution pattern as denoted by the solid lines in FIG. 8 can be provided.
  • the actual road surface light distribution pattern is shown in FIG. 9. As shown in FIG. 9, such mark a on the left side of the running road, pedestrian b at the left side, and pedestrian c present at the right side can sufficiently o become visible for the driver so that safe driving can be assured, as compared with the case of the headlamp structure in the Japanese Utility Model Application Publication previously described.
  • the diffusion function is provided with the reflector 3 and the light beams emitted from the light source are diffused left and right in the horizontal cross section with respect to the optical axis X--X and become incident on the prism zones for forming the diffusion zone of the front lens 2, the droops of both ends of the distribution pattern on the screen in the horizontal direction cannot be generated.
  • each radius of curvature of the prism elements in these zones A, B, F, and H may be reduced (each prism may be thinned). Therefore, such defects as fragments in each prism can be compensated for.
  • the reflector 3 is disposed within the light chamber defined by the housing 1 and front lens 2.
  • the front lens 2 may be attached directly to the front opening of the reflector 3.
  • the above-described embodiment can be a vehicle headlamp in which the front lens 2 faces downward, rises at both ends of the light distribution patterns in the horizontal direction can, in this case, also be prevented.
  • FIGS. 10 to 15 show a second preferred embodiment according to the present invention.
  • FIGS. 10 to 15 the same reference numerals as those shown in FIGS. 1 to 9 designate corresponding elements.
  • Such a sixth prism zone F as described in the first preferred embodiment for forming the diffusion zone at the upper middle center part of the lens is subdivided into a prism zone F 1 for forming the diffusion zone at the upper middle center part and a prism zone F 2 for forming the diffusion zone at the middle center part, as shown in FIG. 10.
  • a conical surface prism 21 is formed on the above-described prism zone F 2 at the middle center, the prism zone F 1 corresponding to the first reflecting surface 31 and the prism zone F 2 corresponding to the second reflecting surface 30.
  • each element of the conical surface prism 21 is produced by cutting the rear surface of the front lens 2 in recess form with a part of conical surface cutter.
  • the radius of curvature of one element of the conical prism 21 is changed according to the slanted direction of the lens 2. It is noted that the radius of curvature "r" at the upper part U of such conical surface prism 21 is smaller than the radius R at the lower part D thereof and the radius of curvature at an intermediate part between the upper and lower parts U and D is gradually changed from “r" to "R".
  • each conical prism 21 if the front lens 2 faces upward, the radius of curvature in the lower part D of each conical prism 21 is made smaller while the radius of curvature in the upper part is made larger.
  • the deepest part of the surface constituting each conical surface prism 21 in order words, a line ⁇ 1 (most recessed bottom surface line) derived by plotting most nearest points of parts of conical surface prism 21 to the front surface 22 of the front lens 2 is made in parallel to a surface axis line ⁇ 2 .
  • This line ⁇ 1 corresponds to a generator of a circular cone.
  • the light incident beams on a center part of each conical surface prism 21 are irradiated in substantially parallel to the incident light beams.
  • each element of the conical surface prism 21 is diffused left and right in the horizontal direction with respect to the optical axis and irradiated substantially in parallel to the optical axis in the vertical cross section.
  • the headlamp structure in the second preferred embodiment is constructed as described above, the same action and effect as in the case of the first preferred embodiment can be achieved. Furthermore, since some parts of diffused light beams reflected from the first reflecting surface 31 at a rear surface of the prism zone F 2 for forming the diffusion zone at the middle center part become incident on the conical surface prism 21, the light distribution pattern can become wider in the left and right directions by areas denoted by a part denoted by (W) in FIG. 15. Consequently, considerably elongated light distribution pattern in the left and right directions can be achieved as compared with a previous elongated light illumination pattern denoted by the broken lines in FIG. 15 in the case of the headlamp structure disclosed in the Japanese Utility Model Application Publication identified in the BACKGROUND OF THE INVENTION.
  • FIGS. 16 to 19 show a third preferred embodiment according to the present invention.
  • a diffusing reflective surface is formed on an upper end part 32 of the reflector 3 which corresponds to the first prism zone A for forming the diffusion zone at the upper left side of the front lens 2, the second prism zone B for forming the diffusion zone at the upper right side, and the sixth prism zone F for forming the diffusion zone at the upper middle center part (or the prism zone F 1 for forming the diffusion zone at the upper middle part) and on a lower end part 37 which corresponds to the eighth prism zone H for forming the diffusion zone exclusively used in the driving beam mode at the lower part of the front lens 2.
  • the diffusion reflecting surface 32 and 37 takes a form of a parabolic line furthermore widely opened left and right with respect to the second reflecting surface 30 as shown in FIG. 18 in the cross section cut away along the line XVIII--XVIII in FIG. 16.
  • a substantially parabolic line is formed as shown in FIG. 19 in the cross section cut away along the line XIX--XIX of FIG. 16.
  • the diffusing reflective surface 32 and 37 described above is such that the light beams emitted from the bulb 4 are diffused left and right by means of the paraboloid surface of revolution more widely opened in the left and right directions than the second reflecting surface 30 in the horizontal cross section with respect to the optical axis X--X and are reflected substantially in parallel to the optical axis X--X in the vertical cross section.
  • This preferred embodiment achieves the same effect as the first preferred embodiment.
  • the diffusion function is provided for the parts of the reflector corresponding to the prism zone for forming the diffusion zone of the front lens, the light beams emitted from the light source can be diffused left and right in the horizontal cross section with respect to the optical axis of the light source, can be reflected substantially in parallel to the optical axis in the vertical direction and can become incident on the prism zones for forming the diffusion zones of the front lens. Hence, such distortions as droops and/or rises of both ends of the light illumination pattern are avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
US07/348,113 1986-07-10 1989-05-05 Structure of headlamps for vehicles Expired - Lifetime US4972307A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP61-105003 1986-07-10
JP1986105003U JPH0317362Y2 (zh) 1986-07-10 1986-07-10

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US07072193 Continuation 1987-07-10

Publications (1)

Publication Number Publication Date
US4972307A true US4972307A (en) 1990-11-20

Family

ID=14395904

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/348,113 Expired - Lifetime US4972307A (en) 1986-07-10 1989-05-05 Structure of headlamps for vehicles

Country Status (2)

Country Link
US (1) US4972307A (zh)
JP (1) JPH0317362Y2 (zh)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5079677A (en) * 1988-08-23 1992-01-07 Ichikoh Industries, Ltd. Headlamp unit for motor vehicles
US5171082A (en) * 1991-01-28 1992-12-15 Koito Manufacturing Co., Ltd. Vehicular headlamp having reflector for controlling luminous intensity distribution pattern
GB2269228A (en) * 1992-07-31 1994-02-02 Bosch Gmbh Robert Fog lamp for vehicles
US5416671A (en) * 1993-06-03 1995-05-16 Koito Manufacturing Co., Ltd. Reflector for vehicular lamp
US5707141A (en) * 1995-07-28 1998-01-13 Koito Manufacturing Co., Ltd. Vehicle lamp
US5727874A (en) * 1995-07-28 1998-03-17 Koito Manufacturing Co., Ltd. Vehicle lamp
DE19716216A1 (de) * 1997-04-18 1998-10-22 Hella Kg Hueck & Co Scheinwerfer für Fahrzeuge
US5971568A (en) * 1995-12-28 1999-10-26 Ushiodenki Kabushiki Kaisha Optical device and multisurface reflector
US6542238B1 (en) * 1998-02-27 2003-04-01 Matsushita Electric Industrial Co., Ltd. Electronic component mounting apparatus
US20040160785A1 (en) * 2002-12-02 2004-08-19 Ichikoh Industries, Ltd. Vehicle headlamp, reflector for the vehicle headlamp, computer program for designing the reflector
US6871991B2 (en) * 2001-03-30 2005-03-29 Valeo Vision Dipped headlight of small size for a motor vehicle
US20060114687A1 (en) * 2004-11-26 2006-06-01 Koito Manufacturing Co., Ltd. Vehicle headlamp
DE102007044963B4 (de) * 2007-07-26 2013-03-28 Erco Gmbh Leuchte
DE19837795B4 (de) * 1997-09-03 2013-10-31 Valeo Vision Spiegel für einen Kurvenscheinwerfer eines Kraftfahrzeugs und Scheinwerfer, der ihn enthält
TWI509487B (zh) * 2014-04-25 2015-11-21 Coretronic Corp 互動觸控系統及光源裝置
US9638386B2 (en) 2012-10-18 2017-05-02 Ichikoh Industries, Ltd. Lighting fixture for vehicle
CN112432137A (zh) * 2019-08-26 2021-03-02 株式会社小糸制作所 透镜及灯具

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01167902A (ja) * 1987-12-24 1989-07-03 Stanley Electric Co Ltd 車両用前照灯

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1686543A (en) * 1927-02-02 1928-10-09 William H Wood Vehicle headlight
DE694291C (zh) * 1932-06-25 1940-07-29 Bosch Gmbh Robert
GB755155A (en) * 1953-06-29 1956-08-15 British Thomson Houston Co Ltd Improvements relating to light projection devices
US3857029A (en) * 1972-04-27 1974-12-24 Minnesota Mining & Mfg Illuminating device
DE2738622A1 (de) * 1976-09-01 1978-03-02 Autopal Np Kraftfahrzeug-scheinwerfer
JPS5447282A (en) * 1977-09-20 1979-04-13 Hitachi Kiden Kogyo Ltd Depalletizer
US4276584A (en) * 1978-03-29 1981-06-30 Ichikawa Press Industries Co., Ltd. Automotive headlight
US4305119A (en) * 1978-05-23 1981-12-08 Lucas Industries Limited Vehicle headlamp
US4523262A (en) * 1981-10-05 1985-06-11 Toyota Jidosha Kabushiki Kaisha Headlight for an automotive vehicle
US4530042A (en) * 1982-11-19 1985-07-16 Cibie Projecteurs Dipped headlamp for automobiles
US4607318A (en) * 1984-05-09 1986-08-19 Robert Bosch Gmbh Headlamp, particularly antidazzle headlamp for motor vehicles
US4608623A (en) * 1983-03-08 1986-08-26 Cibie Projecteurs Automobile headlamp with inclined front glass

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1686543A (en) * 1927-02-02 1928-10-09 William H Wood Vehicle headlight
DE694291C (zh) * 1932-06-25 1940-07-29 Bosch Gmbh Robert
GB755155A (en) * 1953-06-29 1956-08-15 British Thomson Houston Co Ltd Improvements relating to light projection devices
US3857029A (en) * 1972-04-27 1974-12-24 Minnesota Mining & Mfg Illuminating device
DE2738622A1 (de) * 1976-09-01 1978-03-02 Autopal Np Kraftfahrzeug-scheinwerfer
JPS5447282A (en) * 1977-09-20 1979-04-13 Hitachi Kiden Kogyo Ltd Depalletizer
US4276584A (en) * 1978-03-29 1981-06-30 Ichikawa Press Industries Co., Ltd. Automotive headlight
US4305119A (en) * 1978-05-23 1981-12-08 Lucas Industries Limited Vehicle headlamp
US4523262A (en) * 1981-10-05 1985-06-11 Toyota Jidosha Kabushiki Kaisha Headlight for an automotive vehicle
US4530042A (en) * 1982-11-19 1985-07-16 Cibie Projecteurs Dipped headlamp for automobiles
US4608623A (en) * 1983-03-08 1986-08-26 Cibie Projecteurs Automobile headlamp with inclined front glass
US4607318A (en) * 1984-05-09 1986-08-19 Robert Bosch Gmbh Headlamp, particularly antidazzle headlamp for motor vehicles

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5079677A (en) * 1988-08-23 1992-01-07 Ichikoh Industries, Ltd. Headlamp unit for motor vehicles
US5171082A (en) * 1991-01-28 1992-12-15 Koito Manufacturing Co., Ltd. Vehicular headlamp having reflector for controlling luminous intensity distribution pattern
GB2269228A (en) * 1992-07-31 1994-02-02 Bosch Gmbh Robert Fog lamp for vehicles
GB2269228B (en) * 1992-07-31 1995-11-08 Bosch Gmbh Robert Fog lamp for vehicles
US5416671A (en) * 1993-06-03 1995-05-16 Koito Manufacturing Co., Ltd. Reflector for vehicular lamp
US5707141A (en) * 1995-07-28 1998-01-13 Koito Manufacturing Co., Ltd. Vehicle lamp
US5727874A (en) * 1995-07-28 1998-03-17 Koito Manufacturing Co., Ltd. Vehicle lamp
US5971568A (en) * 1995-12-28 1999-10-26 Ushiodenki Kabushiki Kaisha Optical device and multisurface reflector
DE19716216A1 (de) * 1997-04-18 1998-10-22 Hella Kg Hueck & Co Scheinwerfer für Fahrzeuge
DE19837795B4 (de) * 1997-09-03 2013-10-31 Valeo Vision Spiegel für einen Kurvenscheinwerfer eines Kraftfahrzeugs und Scheinwerfer, der ihn enthält
US6542238B1 (en) * 1998-02-27 2003-04-01 Matsushita Electric Industrial Co., Ltd. Electronic component mounting apparatus
US6871991B2 (en) * 2001-03-30 2005-03-29 Valeo Vision Dipped headlight of small size for a motor vehicle
US20040160785A1 (en) * 2002-12-02 2004-08-19 Ichikoh Industries, Ltd. Vehicle headlamp, reflector for the vehicle headlamp, computer program for designing the reflector
US7188982B2 (en) * 2002-12-02 2007-03-13 Ichikoh Industries, Ltd. Vehicle headlamp, reflector for the vehicle headlamp, computer program for designing the reflector
US7461953B2 (en) * 2004-11-26 2008-12-09 Koito Manufacturing Co., Ltd. Vehicle headlamp
US20060114687A1 (en) * 2004-11-26 2006-06-01 Koito Manufacturing Co., Ltd. Vehicle headlamp
DE102007044963B4 (de) * 2007-07-26 2013-03-28 Erco Gmbh Leuchte
US9638386B2 (en) 2012-10-18 2017-05-02 Ichikoh Industries, Ltd. Lighting fixture for vehicle
TWI509487B (zh) * 2014-04-25 2015-11-21 Coretronic Corp 互動觸控系統及光源裝置
CN112432137A (zh) * 2019-08-26 2021-03-02 株式会社小糸制作所 透镜及灯具
CN112432137B (zh) * 2019-08-26 2022-11-15 株式会社小糸制作所 透镜及灯具

Also Published As

Publication number Publication date
JPH0317362Y2 (zh) 1991-04-12
JPS6312101U (zh) 1988-01-26

Similar Documents

Publication Publication Date Title
US4972307A (en) Structure of headlamps for vehicles
JPH0320961Y2 (zh)
KR100438120B1 (ko) 자동차 헤드 램프
CA1294261C (en) Automotive lighting element
US6244732B1 (en) Lamp
US6416210B1 (en) Headlamp for a vehicle
US4213171A (en) Lighting fixture with side escape window
JP2736726B2 (ja) 車輌用前照灯
US4268895A (en) Automotive headlight
EP0355815A3 (en) Headlamp unit for motor vehicles
US5117336A (en) Working spotlight, particularly for motor vehicles
JP2591839B2 (ja) ランプ用反射鏡及びヘッドライトユニット
JP3129643B2 (ja) 車輌用前照灯
US6092918A (en) Vehicular headlamp having improved yield of high-beam luminous energy
EP0884522B1 (en) Headlight for motor vehicles with double-filament lamp
CN214468354U (zh) 遮光结构、遮光件、车灯模组、车灯和车辆
CN212005542U (zh) 一种增强汽车近光车灯远场亮度的照明装置
EP0096785A1 (en) Truncated motor vehicle headlamp
JPH0622923Y2 (ja) 車両用前照灯
CN85203925U (zh) 中近光防眩目机动车辆用前照灯
SU1164513A1 (ru) Противотуманна фара
JPH0220722Y2 (zh)
JPS64646Y2 (zh)
JPH07122101A (ja) 車幅灯兼用前照灯
JPS5952483B2 (ja) 自動車用前照灯

Legal Events

Date Code Title Description
STCF Information on status: patent grant

Free format text: PATENTED CASE

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FPAY Fee payment

Year of fee payment: 12